chore: update ws to 8.21.0, vitest to 4.1.8

[westurner]

Fixes this error message:

# npm audit report

ws  8.0.0 - 8.20.0
Severity: moderate
ws: Uninitialized memory disclosure - https://github.com/advisories/GHSA-58qx-3vcg-4xpx
No fix available
node_modules/@mozilla/firefox-devtools-mcp/node_modules/ws
  @mozilla/firefox-devtools-mcp  *
  Depends on vulnerable versions of ws
  node_modules/@mozilla/firefox-devtools-mcp

2 moderate severity vulnerabilities

Some issues need review, and may require choosing
a different dependency.

• GHSA-58qx-3vcg-4xpx

[juliandescottes]

@westurner thanks for the PR, the CI job is failing, can you update package-lock.json as well? Thanks

[westurner]

@juliandescottes updated package-lock.json. And then npm audit fix --force

[juliandescottes]

Thanks, can you remove the carets from the versions?

[westurner]

Someday also:

• Create an AGENTS.md and
• Create a devcontainer.json with e.g. playwright install build-cached in a Dockerfile.e2e
  • https://github.com/westurner/memegern/blob/main/.devcontainer/devcontainer.json
  • https://github.com/westurner/memegern/blob/main/e2etest.sh
  • https://github.com/westurner/memegern/blob/main/Dockerfile.e2e
    • This caches the playwright install commands in a build layer so that if you keep re-running the build (on the same worker), it will only download the browser(s) once for playwright tests and also for MCP servers such as firefox-devtools-mcp and chrome-devtools-mcp: https://github.com/westurner/memegern/blob/4b51585f06891a003dadc04516717354c1fac45d/Dockerfile.e2e#L187-L188

[juliandescottes]

Someday also:

* Create an AGENTS.md and

There is one already, but yes it could mention the policy about version numbers.

The tests are failing, I guess it's because of the vitest update, can you take a look?

[juliandescottes]

Had a quick look, should just require to migrate mocks in core-prefs.test.ts (https://github.com/mozilla/firefox-devtools-mcp/blob/main/tests/firefox/core-prefs.test.ts#L25-L50) and core.test.ts (https://github.com/mozilla/firefox-devtools-mcp/blob/main/tests/firefox/core.test.ts#L95-L118) to use classes for Options, ServiceBuilder and Builder.